高速公路入口匝道的模糊逻辑控制及辅助方案设计

On-ramp fuzzy logic control and auxiliary project design of freeway

为保证高速公路主线安全、畅通与舒适运行,减少对相连道路的影响,构造了匝道逻辑模糊控制器,提出了三种入口匝道辅助设计方案。结合工程实际,选择了上游车流密度、下游车流密度和入口处等待车辆的总长度作为模糊控制器的输入量,入口匝道的调节率为输出量。计算结果表明,随着入口匝道车辆数量的增加,高速公路主线下游的车速将明显下降,根据主线上、下游车流密度及匝道车辆的数量变化,计算出不同的匝道调节率,通过对高速公路入口匝道的调节率进行实时调节,可控制匝道上车辆的进入,入口匝道辅助方案的实施可缓解与高速公路相连道路的拥堵,对改善高速公路运行安全和效率具有重要的作用。

In order to ensure the safe, expedite and comfortable operation of freeway mainline, and to lessen its influence on linked roads, a fuzzy logic controller of on-ramp was constructed, three kinds of auxiliary on-ramp projects were designed. In practical engineering, the upstream density, downstream density and entrance queue of vehicle-flux were selected as controller inputs, the metering rate of onramp was selected as controller output. Calculated result indicates that downstream vehicle speeds in mainline are decreasing obviously with the increasing of vehicle number in on-ramp; according to upstream density, downstream density and vehicle number, ramp metering rate can be calculated; the entrance of on-ramp vehicles can be controlled by the real-time adjusting of the metering rate of freeway on-ramp, the application of auxiliary projects can alleviate the congestion of linked roads, and improve the safety and efficiency of freeway running. 1 tab, 5 figs, 11 refs.